如何在Global.aspx的Application_Start中获得完整的主机名+端口号?

I tried

我试着

Uri uri = HttpContext.Current.Request.Url;
String host = uri.Scheme + Uri.SchemeDelimiter + uri.Host + ":" + uri.Port;

and it worked well on my local machine, but when being published to IIS7, there is an exception saying

它在我的本地机器上运行得很好，但是当它被发布到IIS7时，有一个例外的说法

System.Web.HttpException: Request is not available in this context

Anyone know how to achieve this?

有人知道怎么做到吗?

3 个解决方案

#1

When your web application starts, there is no HTTP request being handled.

当web应用程序启动时，没有处理HTTP请求。

You may want to handle define the Application_BeginRequest(Object Sender, EventArgs e) method in which the the Request context is available.

您可能想要处理定义Application_BeginRequest(对象发送方、EventArgs e)方法，其中请求上下文可用。

Edit: Here is a code sample inspired by the Mike Volodarsky's blog that Michael Shimmins linked to:

编辑:这里有一个代码示例，灵感来自迈克·沃罗达斯基的博客，迈克尔·希明斯链接到:

    void Application_BeginRequest(Object source, EventArgs e)
    {
        HttpApplication app = (HttpApplication)source;
        var host = FirstRequestInitialisation.Initialise(app.Context);
    }

    static class FirstRequestInitialisation
    {
        private static string host = null;
        private static Object s_lock = new Object();

        // Initialise only on the first request
        public static string Initialise(HttpContext context)
        {
            if (string.IsNullOrEmpty(host))
            {
                lock (s_lock)
                {
                    if (string.IsNullOrEmpty(host))
                    {
                        var uri = context.Request.Url;
                        host = uri.GetLeftPart(UriPartial.Authority);
                    }
                }
            }

            return host;
        }
    }

#2

The accepted answer is good, but in most cases (if the first request is a HTTP Request) you should better use the Session_Start event, which is called once per user every 20 minutes or so (not sure how long the session is valid). Application_BeginRequest will be fired at every Request.

接受的答案是好的，但是在大多数情况下(如果第一个请求是HTTP请求)，您最好使用Session_Start事件，每个用户每20分钟调用一次(不确定会话的有效时间)。每个请求都会触发Application_BeginRequest。

public void Session_Start(Object source, EventArgs e)
{
   //Request / Request.Url is available here :)
}

#3

Just answering this so if someone ever decides to actually search on this topic...

只要回答这个问题，如果有人决定真的搜索这个话题……

This works on application start in any mode...

这适用于任何模式下的应用程序启动……

typeof(HttpContext).GetField("_request", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(HttpContext.Current)

#1